Re: How to structure Local service?

If you're worried about duplicate content issues, then noindex the pages. If all the pages have unique content and are highly relevant to the suburbs/areas, then you shouldn't have an issue.

For PPC, you want a different kind of landing page. You won't have a navigation, and there should be a highly targeted offer to get someone to fill out a form or make a call. There should be a very different strategy in place for PPC than you have running for SEO, but the two should be consistent in messaging.